CN110586029A - Salt modified silicate cement phosphorus removal adsorbent, preparation method of adsorbent, regeneration method of adsorbent and application - Google Patents
Salt modified silicate cement phosphorus removal adsorbent, preparation method of adsorbent, regeneration method of adsorbent and application Download PDFInfo
- Publication number
- CN110586029A CN110586029A CN201910897790.0A CN201910897790A CN110586029A CN 110586029 A CN110586029 A CN 110586029A CN 201910897790 A CN201910897790 A CN 201910897790A CN 110586029 A CN110586029 A CN 110586029A
- Authority
- CN
- China
- Prior art keywords
- adsorbent
- portland cement
- phosphorus removal
- salt
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003463 adsorbent Substances 0.000 title claims abstract description 102
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 79
- 239000011574 phosphorus Substances 0.000 title claims abstract description 79
- 238000002360 preparation method Methods 0.000 title abstract description 16
- 239000003469 silicate cement Substances 0.000 title abstract description 10
- -1 Salt modified silicate Chemical class 0.000 title abstract description 8
- 238000011069 regeneration method Methods 0.000 title abstract description 6
- 239000011398 Portland cement Substances 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000005406 washing Methods 0.000 claims abstract description 18
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 16
- 150000003839 salts Chemical class 0.000 claims abstract description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 12
- 238000001035 drying Methods 0.000 claims abstract description 11
- 238000012216 screening Methods 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims abstract description 8
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 7
- 239000011737 fluorine Substances 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims description 35
- 238000000034 method Methods 0.000 claims description 26
- 229910000329 aluminium sulfate Inorganic materials 0.000 claims description 15
- 239000007864 aqueous solution Substances 0.000 claims description 15
- 238000012986 modification Methods 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 11
- 230000036571 hydration Effects 0.000 claims description 10
- 238000006703 hydration reaction Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 7
- 230000004048 modification Effects 0.000 claims description 7
- 230000007935 neutral effect Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 239000008187 granular material Substances 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 239000002985 plastic film Substances 0.000 claims description 3
- 229920006255 plastic film Polymers 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 239000002594 sorbent Substances 0.000 claims description 3
- 239000008399 tap water Substances 0.000 claims description 3
- 235000020679 tap water Nutrition 0.000 claims description 3
- 229920002472 Starch Polymers 0.000 claims description 2
- 230000001172 regenerating effect Effects 0.000 claims description 2
- 239000008107 starch Substances 0.000 claims description 2
- 235000019698 starch Nutrition 0.000 claims description 2
- 230000000274 adsorptive effect Effects 0.000 claims 2
- 229920001577 copolymer Polymers 0.000 claims 1
- 229920006037 cross link polymer Polymers 0.000 claims 1
- 239000007921 spray Substances 0.000 claims 1
- 238000001179 sorption measurement Methods 0.000 abstract description 60
- 230000000694 effects Effects 0.000 abstract description 14
- 230000000887 hydrating effect Effects 0.000 abstract 1
- 239000004568 cement Substances 0.000 description 11
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 10
- 238000001878 scanning electron micrograph Methods 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- 229910019142 PO4 Inorganic materials 0.000 description 6
- 239000010452 phosphate Substances 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000012851 eutrophication Methods 0.000 description 4
- 229910001385 heavy metal Inorganic materials 0.000 description 4
- 210000001161 mammalian embryo Anatomy 0.000 description 4
- 239000008188 pellet Substances 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 150000004760 silicates Chemical class 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010170 biological method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009388 chemical precipitation Methods 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- WYWFMUBFNXLFJK-UHFFFAOYSA-N [Mo].[Sb] Chemical compound [Mo].[Sb] WYWFMUBFNXLFJK-UHFFFAOYSA-N 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910000402 monopotassium phosphate Inorganic materials 0.000 description 1
- 235000019796 monopotassium phosphate Nutrition 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/0248—Compounds of B, Al, Ga, In, Tl
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/0274—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04 characterised by the type of anion
- B01J20/0281—Sulfates of compounds other than those provided for in B01J20/045
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/345—Regenerating or reactivating using a particular desorbing compound or mixture
- B01J20/3475—Regenerating or reactivating using a particular desorbing compound or mixture in the liquid phase
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
- C02F2101/14—Fluorine or fluorine-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Water Treatment By Sorption (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention discloses a salt modified portland cement phosphorus removal adsorbent, a preparation method of the adsorbent, a regeneration method of the adsorbent and application. The raw materials of the adsorbent comprise portland cement, water and a water-retaining agent. The preparation method comprises mixing and stirring, hydrating, maintaining, crushing and screening, washing, salt modifying and drying. The regeneration method is to put the used dephosphorizing adsorbent into 0.1-1mol/L sodium hydroxide solution to be soaked for 1-2 hours. The salt modified silicate cement phosphorus removal adsorbent has the functions of adsorbing phosphorus removal and adsorbing fluorine removal. The scheme provides the modified portland cement phosphorus removal adsorbent which has the advantages of good adsorption effect and long adsorption time.
Description
Technical Field
The invention relates to the field of an environment-friendly water treatment adsorbent, in particular to a salt modified portland cement phosphorus removal adsorbent, a preparation method of the adsorbent, a regeneration method of the adsorbent and application of the adsorbent.
Background
The nitrogen and phosphorus elements enter the water body, the most direct result is water body eutrophication, and researches show that when the total nitrogen is more than 0.2-0.3mg/L and the total phosphorus is more than 0.01-0.02mg/L, the water body starts the eutrophication process, and the water body eutrophication is not necessarily generated due to the high content of the nitrogen elements, so the phosphorus is the more deep reason of the water body eutrophication.
At present, the main methods for removing phosphorus include a chemical precipitation method, a biological method, an ecological method, an adsorption method and the like. The chemical precipitation method and the biological method are phosphorus removal methods which are widely applied at present, but the chemical method has the problems of high cost and easy generation of secondary pollution; the biological rule has strict operation conditions, unstable effect and easy substandard effluent; the ecological method is to use land and wetland to remove phosphorus in the wastewater, and actually uses plants to absorb and degrade phosphorus, and the method has few examples at present, and the treatment effect and the process design need to be further discussed; the adsorption method has the advantages of large adsorption capacity, low energy consumption, low pollution, quick removal, recyclability and the like, and can achieve the purposes of fully utilizing the adsorbent and recovering phosphorus resources through desorption. Thus, the use of adsorption to remove phosphorus is particularly important, and the preparation and selection of the adsorbent is critical.
At the present stage, a plurality of methods for preparing the adsorbent are provided, such as a loading method, a crosslinking method and the like, but the preparation process is complicated, the adsorption effect is poor, the cost is high, and the large-scale engineering application cannot be realized.
Based on the above problems, the prior application document with publication number CN106824050A discloses a method for preparing a phosphorus removal adsorbent, which comprises mixing and stirring alumina, cement and a water retention agent, adding water to obtain an embryo body, and sequentially performing curing, crushing, washing, modifying and drying on the embryo body to obtain the phosphorus removal adsorbent.
In the scheme, the phosphorus removal adsorbent is prepared by modifying the composition of the alumina, the cement and the water retention agent, but the cost of the selected alumina is relatively high, and the treatment cost is increased in the actual phosphorus removal operation.
Disclosure of Invention
In view of the defects of the prior art, the first object of the invention is to provide a salt-modified portland cement phosphorus removal adsorbent which has the advantage of low preparation cost.
The second purpose of the invention is to provide a preparation method of the salt modified portland cement phosphorus removal adsorbent, which has the advantage of simple preparation method.
A third object of the present invention is to provide a method for regenerating a salt-modified portland cement phosphorus removal adsorbent, which has an advantage that the salt-modified portland cement phosphorus removal adsorbent after use can be reused.
The fourth purpose of the invention is to provide the application of the salt modified portland cement phosphorus removal adsorbent, which has the advantage of wide application.
In order to achieve the first object, the invention provides the following technical scheme: the salt modified portland cement phosphorus removal adsorbent comprises the following raw materials of cement, water and a water-retaining agent, wherein the mass ratio of the cement to the water-retaining agent is 0.8-1.2: 0.35-0.5: 0.005-0.006, and also comprises 0.25-1mol/L aluminum sulfate solution.
By adopting the technical scheme, the main raw material in the scheme is the Portland cement which has great yield in China and is cheap and easy to obtain. At present, about 2000 yuan per ton of industrial alumina, about 400 yuan per ton of ordinary portland cement and about 6000 ton of active alumina are available on the market, so that the cost is obviously reduced by selecting portland cement. And the adsorption capacity of the phosphorus removal adsorbent prepared by the method can reach 25.9mg/g when the adsorption is balanced, so that the service life of the filler is greatly prolonged, and the cost can be saved.
In the concrete adsorbent, the silicate cement contains abundant calcium, aluminum and iron adsorbents, so that the capacity of adsorbing phosphorus is strong, the price is low, and the raw materials are easy to obtain. At the initial stage of formation of hydrated portland cement, a large amount of alkalinity can be released in water, and the hydrated portland cement can rapidly react with phosphate to achieve the effect of removing phosphorus.
The water-retaining agent can delay the hydration speed of the silicate cement, so that the hydration is more sufficient, the formation of pores in the silicate cement is promoted, and the adsorption capacity is improved.
Further, the water-retaining agent is a starch grafted acrylate copolymerization crosslinking product.
By adopting the technical scheme, after the cement is mixed according to a certain water cement ratio, the cement begins to hydrate. The water-retaining agent can slowly release water from the interior of the hydrated cement, so that not only is the hydration effect more sufficient, but also more gaps can be promoted to be generated in the interior, and the adsorption capacity is improved.
In order to achieve the second object, the invention provides the following technical scheme: the preparation method of the salt modified portland cement phosphorus removal adsorbent is characterized by comprising the following preparation steps:
step 1: mixing and stirring: grinding the cement, sieving the ground cement by a 200-mesh sieve, adding a water-retaining agent, and uniformly stirring;
step 2: hydration: adding water into the uniformly mixed material obtained in the step one for hydration, and uniformly mixing to obtain a blank;
and step 3: maintaining;
and 4, step 4: crushing and screening;
and 5: washing: continuously washing the particles obtained in the step 4 under water;
step 6: salt modification: washing the granules with Al2(SO4)3Modifying the aqueous solution;
and 7: drying: and (4) taking out the modified particles obtained in the step (6) and drying to obtain the phosphorus removal adsorbent.
By adopting the technical scheme, the hydration in the step 2 aims at improving the strength of the adsorbent and improving the influence of alkaline substances of the portland cement on the adsorption effect;
curing in step 3, in order to better show the strength of the adsorbent;
the crushing and screening in the step 4 can form proper particle size, increase the specific surface area of adsorption and realize better adsorption effect.
The alkaline substances in the portland cement can be converted into non-alkaline substances by flushing in the step 5, and substances such as residual CaO on the surfaces of portland cement particles can not obviously interfere with the adsorption process of the phosphate.
The modification in step 6 can increase the initial adsorption rate.
Further, the curing step in the step 3 comprises covering the blank body in the step 2 with a plastic film at normal temperature and pressure, and spraying and curing for 8-10 days.
By adopting the technical scheme, the maintenance operation is consistent with the maintenance of concrete, and the strength of the adsorbent can be enhanced.
Further, the crushing and screening in the step 4 comprises crushing and screening the embryo body cured in the step 3 to obtain particles with the particle size of 0.6-2.5 mm.
By adopting the technical scheme, the particles are crushed into the particle size, the adsorption area can be increased, and a more excellent dephosphorization adsorption effect is achieved.
Further, the rinsing step in step 5 specifically comprises rinsing continuously under tap water for 90 days, and adjusting the pH to neutral, and the conductivity to 100. mu.s/m.
By adopting the technical scheme, the main components in the portland cement comprise calcium carbonate and calcium hydroxide, the calcium hydroxide reacts with carbon dioxide in the air to generate calcium carbonate in the washing process, the calcium hydroxide in the hydrated portland cement disappears after washing, and the content of the calcium carbonate is increased.
Further, the washed particles in step 5 are mixed with Al2(SO4)3The solid-liquid ratio of the aqueous solution is 1: (8-12), shaking at 160r/min for 6h, taking out the particles, and washing for multiple times until the pH is neutral.
By adopting the technical scheme, Al is added2(SO4)3After the water solution, the adsorbent is alkaline, and aluminum is amphoteric metal, so that the adsorbent is preparedMore aluminum-based active groups are formed on the surface, and the adsorption of phosphate radical anion is more facilitated.
In order to achieve the third object, the invention provides the following technical solutions: the regeneration method of the phosphate-removing adsorbent of the salt modified silicate cement is characterized by comprising the following steps: the used dephosphorizing adsorbent is soaked in 0.1-1mol/L sodium hydroxide solution for 1-2 hours.
By adopting the technical scheme, the dephosphorization adsorbent soaked by the sodium hydroxide can remove the precipitate adsorbed on the adsorbed adsorbent, so that the adsorption performance is recovered.
In order to achieve the fourth object, the invention provides the following technical solutions: the salt modified portland cement phosphorus removal adsorbent has the functions of adsorbing phosphorus removal and adsorbing fluorine removal.
By adopting the technical scheme, the phosphorus removal adsorbent provided by the invention not only can generate an effect on phosphorus removal, but also has an effect on fluorine removal, and is wide in application and good in using effect.
In conclusion, the invention has the following beneficial effects:
firstly, the phosphorus removal adsorbent prepared by the invention has excellent physical and chemical properties, has the advantages of rough surface, high porosity and high mechanical strength, can be used for removing phosphorus in artificial wetlands, and is also suitable for being widely popularized and applied as the phosphorus removal adsorbent for various structures of water plants and lakes and rivers.
Secondly, the phosphorus removal adsorbent prepared by the invention is prepared from silicate cement which mainly comprises calcium silicate, and the silicate cement has a large yield in China and is cheap and easy to obtain. The phosphorus removal adsorbent prepared by the invention has lower price (about 2000 yuan per ton of industrial alumina, about 400 yuan per ton of ordinary portland cement and about 6000 yuan per ton of active alumina) than an adsorbent prepared by pure metal oxide, has small mud yield and makes up the disadvantage of using the alumina as the adsorbent. The invention has simple production process, is beneficial to large-scale production, has few raw materials, only contains the Portland cement and the water-retaining agent, does not need to add other harmful substances, and does not cause secondary pollution when treating the phosphorus-containing wastewater.
Thirdly, the phosphorus removal adsorbent prepared by the invention has excellent property, and the adsorption capacity is far larger than that of other phosphorus removal adsorption materials (according to the literature, the maximum adsorption capacity of the activated alumina to phosphorus is 5.83mg/g, the maximum adsorption capacity of the activated alumina to phosphorus in water is 20.88mg/g by theoretical fitting, the adsorbents with higher adsorption capacity are all lanthanum oxide, zirconium oxide load and the like, the cost is higher, and the preparation method is complex). The adsorption capacity of the phosphorus removal adsorption prepared by the invention is up to 25.9mg/g when the phosphorus removal adsorption is balanced, so that the service life of the filler is greatly prolonged, and the cost is saved. The phosphorus removal adsorbent provided by the invention is high in initial adsorption speed, the adsorption capacity reaches 5.29mg/g within 4 hours of adsorption, and other adsorbents reach the value which needs 20-50 hours, so that the hydraulic retention time is reduced, and the phosphorus removal adsorbent is beneficial to practical engineering application.
Fourth, the phosphorus removal adsorbent prepared by the invention has a wide application range, and tests show that the adsorbent can remove other pollutants, such as fluorine and heavy metals such as lead and copper, while removing phosphorus, and has great advantages. Compared with other adsorbents, the phosphorus removal adsorbent has much higher phosphorus removal adsorption capacity and adsorption speed than other adsorbents, prolongs the service life of the adsorbents, and effectively reduces the cost of the phosphorus removal adsorbents.
Drawings
FIG. 1 is a flow chart of the preparation of the salt-modified silicate phosphorus removal sorbent of example 2;
FIG. 2 is an SEM image of the phosphorus removal adsorbent of example 2 prior to adsorption at 2000X;
FIG. 3 is an SEM image of the dephosphorizing adsorbent of example 2 before adsorption at 10000X;
FIG. 4 is a graph of adsorption kinetics at 2000X for example 2;
FIG. 5 is a graph of adsorption kinetics at 10000X for example 2;
FIG. 6 is an XRD pattern before and after adsorption in example 2.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples.
Example 1
Modified silicate waterThe raw materials of the phosphorus removal adsorbent comprise 160g of cement, 70g of water and 1g of water-retaining agent. Al (Al)2(SO4)3The solution was selected to be 0.5 mol/L.
The preparation method of the modified silicate cement phosphorus removal adsorbent comprises the following preparation steps:
step 1: mixing and stirring: grinding 160g of portland cement, sieving with a 200-mesh sieve, adding 1g of water-retaining agent, and uniformly stirring;
step 2, hydration: adding 70g of water into the uniformly mixed material obtained in the step 1 for hydration, and uniformly mixing to obtain a blank;
and step 3: maintaining; covering the blank body in the step 2 with a plastic film at normal temperature and normal pressure, and spraying and maintaining for 8 days;
and 4, step 4: crushing and screening; crushing and screening the maintained embryo body, and selecting particles with the particle size of 0.6-2.5 mm;
and 5: washing: continuously washing the particles obtained in the step 4 under water; and (4) continuously washing the particles obtained in the step (4) under tap water for 90 days to obtain particles with neutral pH, and controlling the conductivity to be 100 mu s/m.
Step 6: salt modification: washing the granules with Al2(SO4)3Modification of the aqueous solution, in particular washed particles with Al2(SO4)3The solid-liquid ratio of the aqueous solution is 1: 10, and shaking at 160r/min for 4 h;
and 7: drying: and (4) taking out the modified particles obtained in the step (6) and drying to obtain the phosphorus removal adsorbent, wherein the specific drying condition is set to be drying for 1h at 105 ℃.
Examples 2 to 6
Examples 2-6 differ from example 1 in the amount of the components, see table 1 for specific components.
Table 1 feed of adsorbents for examples 1-6
Experimental detection
The measurement and analysis of molybdenum-antimony by spectrophotometry resistance: 0.4g of the phosphorus removal adsorbent prepared in each example is taken, added into a 250mL conical flask, 200mL of 100mg/L potassium dihydrogen phosphate solution is added, samples are taken after 4h and 72h of oscillation at 25 ℃ and 160r/min, the samples pass through a 0.45um filter membrane, and the adsorption capacity and the mass loss rate of the phosphorus removal adsorbent prepared in each example are calculated by measuring and analyzing with an ultraviolet spectrophotometer, and two parallel samples are prepared in each example.
(II) because the particle diameter of the particles is small, the particle strength tester can not accurately test the strength of the particles, so that the mass loss rate is adopted to characterize the strength of the phosphorus removal adsorbent, taking the example 2 as an example: placing 1g of the phosphorus removal adsorbent in a conical flask, adding 100ml of distilled water, placing in a shaking table for shaking at a shaking frequency of 200rpm for 17 hours, filtering, drying, then screening, and weighing to calculate the mass loss rate. The mass loss rate of the adsorbents prepared in the embodiments 1 to 6 is about 6 to 8 percent, and the adsorbents have high strength and can meet the requirements of engineering application such as constructed wetlands.
The calculation formula of the adsorption capacity in the invention isIn the formula: q is the adsorption capacity (mg/g), C0、C1The initial and the residual phosphate concentration after the reaction (mg/L) are respectively, m is the addition amount of the adsorbent (g), and V is the volume of the solution (L).
Table 2 physicochemical properties and adsorption capacity for phosphorus of examples 1 to 6.
The results show that examples 1 to 6 all have a certain phosphorus removal effect, and the equilibrium capacity of the adsorbents prepared in examples 1 to 6 is 20 to 26mg/g, which is larger than the adsorption capacity of the common phosphorus removal adsorbents, as shown in table 2.
FIGS. 2 to 5 are SEM images of the phosphorus-removing adsorbent before and after adsorption in example 2, wherein the SEM image in FIG. 2 is X2000 before adsorption, the SEM image in FIG. 3 is X10000 before adsorption, the SEM image in FIG. 4 is X2000 after adsorption, and the SEM image in FIG. 5 is X10000 after adsorption; as can be seen from FIGS. 2 and 3, the phosphorus removal adsorbent prepared in example 2 has a large specific surface area and a rugged surfaceRough and more porous, which is beneficial to adsorption, and the adsorbed PO can be seen from figures 4 and 54 2-The particles on the rear surface are scoured by water flow in the adsorption process, so that the surface is smoother from unevenness; while many particles are present on the surface of the adsorbent.
FIG. 6 is a graph of the kinetics of phosphate adsorption by the adsorbent prepared in example 2. As can be seen from the above graph, the adsorption capacity reached 5.29mg/g for 4 hours and 25.9mg/g for 72 hours.
Experiments show that the phosphorus removal adsorbent can remove phosphate radicals in water and fluoride ions in water, 0.6g of the adsorbent is added into 200mL of fluorine solution, the fluorine solution is placed into a shaking incubator at 25 ℃, the shaking frequency is 160rpm, and the equilibrium adsorption capacity is 10-20 mg/g. In addition, according to the adsorption capacity of the metal oxide on heavy metals, the adsorbent is suspected to have certain adsorption capacity on the heavy metals in the automobile exhaust, and the adsorbent has certain advantages for reducing heavy metal ions.
Example 7
Example 7 differs from example 1 in that the curing time in step 3 was 9 days.
Example 8
Example 8 differs from example 1 in that the curing time in step 3 was 10 days.
Example 9
Example 9 differs from example 1 in that the washed pellets were treated with Al2(SO4)3Modification of the aqueous solution, in particular washed particles with Al2(SO4)3The solid-liquid ratio of the aqueous solution is 1: 5 and shaken at 160r/min for 4 h.
Example 10
Example 10 differs from example 1 in that the washed pellets were treated with Al2(SO4)3Modification of the aqueous solution, in particular washed particles with Al2(SO4)3The solid-liquid ratio of the aqueous solution is 1: 8, and shaking at 160r/min for 7 h.
Example 11
Examples11 differs from example 1 in that the washed pellets were treated with Al2(SO4)3Modification of the aqueous solution, in particular washed particles with Al2(SO4)3The solid-liquid ratio of the aqueous solution is 1: 12 and shaken at 160r/min for 8 h.
Example 12
Example 12 differs from example 1 in that the washed pellets were treated with Al2(SO4)3Modification of the aqueous solution, in particular washed particles with Al2(SO4)3The solid-liquid ratio of the aqueous solution is 1: 12 and shaken at 160r/min for 10 h.
Table 3 physicochemical properties and adsorption capacity for phosphorus of examples 7-12.
As shown in Table 3, examples 7 to 12 all have a certain effect of removing phosphorus, and the adsorbents prepared in examples 7 to 12 have an equilibrium capacity of about 23 to 25mg/g, which is larger than the adsorption capacity of the common phosphorus removal adsorbents.
Comparative example 1
The particles obtained in step 5, which is a difference between comparative example 1 and example 1, were not subjected to the salt modification process of step 6.
Experimental detection
Table 4 physicochemical properties and adsorption capacity for phosphorus of comparative example 1.
The results show that the phosphorus removal adsorbents prepared in the examples have a much larger adsorption capacity than the unmodified comparative adsorbent in 4h, as shown in table 4, indicating that the salt modification can greatly increase the initial adsorption rate of the adsorbent.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (9)
1. The salt modified portland cement phosphorus removal adsorbent is characterized in that raw materials of the adsorbent comprise portland cement, water and a water-retaining agent, wherein the mass ratio of the portland cement to the water-retaining agent is 0.8-1.2: 0.35-0.5: 0.005-0.006, and further comprises 0.25-1mol/L Al2(SO4)3An aqueous solution.
2. The salt-modified portland cement phosphorus removal sorbent of claim 1, wherein the water retention agent is a starch grafted acrylate copolymer cross-linked polymer.
3. A method for preparing the phosphate-removing adsorbent of salt-modified portland cement according to claim 2, comprising the following steps:
step 1: mixing and stirring: grinding the portland cement, sieving with a 200-mesh sieve, adding the water-retaining agent, and uniformly stirring;
step 2: hydration: adding water into the uniformly mixed material obtained in the step one for hydration, and uniformly mixing to obtain a blank;
and step 3: maintaining;
and 4, step 4: crushing and screening;
and 5: washing: continuously washing the particles obtained in the step 4 under water;
step 6: salt modification: washing the granules with Al2(SO4)3Modifying the aqueous solution;
and 7: drying: and (4) taking out the modified particles obtained in the step (6) and drying to obtain the phosphorus removal adsorbent.
4. The method for preparing the phosphate-removing adsorbent of salt-modified portland cement as claimed in claim 3, wherein the curing step in step 3 comprises covering the green body in step 2 with a plastic film at normal temperature and pressure and spray curing for 8-10 days.
5. The method for preparing the phosphate-removing adsorbent of salt-modified portland cement according to claim 3, wherein the crushing and screening in step 4 comprises crushing and screening the green body cured in step 3 to obtain particles with a particle size of 0.6-2.5 mm.
6. The method for preparing the phosphate-removing adsorbent of salt-modified portland cement according to claim 3, wherein the washing step in step 5 comprises washing the particles obtained in step 4 with tap water for 90 days continuously, adjusting the pH to neutral, and adjusting the conductivity to 100 μ s/m.
7. The method for preparing the phosphate-removing adsorbent for salt-modified portland cement according to claim 6, wherein the washed particles in step 5 are mixed with Al2(SO4)3The solid-liquid ratio of the aqueous solution is 1: (5-12), shaking at 160r/min for 4-10h, taking out the particles, and washing for multiple times until the pH is neutral.
8. A method of regenerating the salt-modified portland cement phosphorus removal sorbent of any one of claims 4-7, comprising the steps of: the used dephosphorizing adsorbent is soaked in 0.1-1mol/L sodium hydroxide solution for 1-2 hours.
9. Use of the salt-modified portland cement phosphorus removal adsorbent of any one of claims 4-7 for adsorptive phosphorus removal and adsorptive fluorine removal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910897790.0A CN110586029A (en) | 2019-09-21 | 2019-09-21 | Salt modified silicate cement phosphorus removal adsorbent, preparation method of adsorbent, regeneration method of adsorbent and application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910897790.0A CN110586029A (en) | 2019-09-21 | 2019-09-21 | Salt modified silicate cement phosphorus removal adsorbent, preparation method of adsorbent, regeneration method of adsorbent and application |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110586029A true CN110586029A (en) | 2019-12-20 |
Family
ID=68862186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910897790.0A Pending CN110586029A (en) | 2019-09-21 | 2019-09-21 | Salt modified silicate cement phosphorus removal adsorbent, preparation method of adsorbent, regeneration method of adsorbent and application |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110586029A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113735327A (en) * | 2021-09-26 | 2021-12-03 | 成都理工大学 | Coagulant for synchronously removing fluorine and phosphorus in phosphorus chemical wastewater and removing method thereof |
| CN117258763A (en) * | 2023-11-16 | 2023-12-22 | 山东吉昌龙环境工程有限公司 | Preparation method of efficient composite deep defluorinating agent |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002249348A (en) * | 2001-02-16 | 2002-09-06 | Natoo Kenkyusho:Kk | Ordinary temperature hydraulic solidifying agent and water-and-heat-resistant porous solidified body |
| CN102205229A (en) * | 2011-05-23 | 2011-10-05 | 合肥工业大学 | Phosphorous removal adsorbent and preparation method thereof |
| CN102390951A (en) * | 2011-08-10 | 2012-03-28 | 中国铁道科学研究院铁道建筑研究所 | Internal curing material of high-performance concrete and preparation method thereof |
| CN103170303A (en) * | 2013-04-15 | 2013-06-26 | 北京中地泓科环境科技有限公司 | Method for utilizing silicate cement as raw material to prepare fluorine removal agent |
| CN104528902A (en) * | 2014-12-16 | 2015-04-22 | 上海交通大学 | Novel polymeric aluminum chloride dephosphorizing filler and preparation method thereof |
| CN104909709A (en) * | 2015-05-26 | 2015-09-16 | 武汉市市政建设集团有限公司 | Green rapid-hardening early-strength magnesium phosphate-based healant and preparation method thereof |
| CN106824050A (en) * | 2017-01-22 | 2017-06-13 | 西安建筑科技大学 | A kind of preparation method of dephosphorization adsorbent |
| CN109675517A (en) * | 2018-12-11 | 2019-04-26 | 西安建筑科技大学 | A kind of high temperature modified high alumina cement de-fluoridation adsorbent, preparation method and applications |
| CN111003781A (en) * | 2019-12-04 | 2020-04-14 | 成都理工大学 | Application of a kind of sulfoaluminate cement and phosphorus removal method |
| CN111807504A (en) * | 2020-08-10 | 2020-10-23 | 吴昊 | Dephosphorization and denitrification wetland filler and preparation method thereof |
-
2019
- 2019-09-21 CN CN201910897790.0A patent/CN110586029A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002249348A (en) * | 2001-02-16 | 2002-09-06 | Natoo Kenkyusho:Kk | Ordinary temperature hydraulic solidifying agent and water-and-heat-resistant porous solidified body |
| CN102205229A (en) * | 2011-05-23 | 2011-10-05 | 合肥工业大学 | Phosphorous removal adsorbent and preparation method thereof |
| CN102390951A (en) * | 2011-08-10 | 2012-03-28 | 中国铁道科学研究院铁道建筑研究所 | Internal curing material of high-performance concrete and preparation method thereof |
| CN103170303A (en) * | 2013-04-15 | 2013-06-26 | 北京中地泓科环境科技有限公司 | Method for utilizing silicate cement as raw material to prepare fluorine removal agent |
| CN104528902A (en) * | 2014-12-16 | 2015-04-22 | 上海交通大学 | Novel polymeric aluminum chloride dephosphorizing filler and preparation method thereof |
| CN104909709A (en) * | 2015-05-26 | 2015-09-16 | 武汉市市政建设集团有限公司 | Green rapid-hardening early-strength magnesium phosphate-based healant and preparation method thereof |
| CN106824050A (en) * | 2017-01-22 | 2017-06-13 | 西安建筑科技大学 | A kind of preparation method of dephosphorization adsorbent |
| CN109675517A (en) * | 2018-12-11 | 2019-04-26 | 西安建筑科技大学 | A kind of high temperature modified high alumina cement de-fluoridation adsorbent, preparation method and applications |
| CN111003781A (en) * | 2019-12-04 | 2020-04-14 | 成都理工大学 | Application of a kind of sulfoaluminate cement and phosphorus removal method |
| CN111807504A (en) * | 2020-08-10 | 2020-10-23 | 吴昊 | Dephosphorization and denitrification wetland filler and preparation method thereof |
Non-Patent Citations (4)
| Title |
|---|
| 周洪燕: "《土木工程材料》", 31 August 2018, 北京理工大学出版社 * |
| 宋国壮: "多外加剂对硬化水泥浆体强度及水化特征的影响", 《建筑材料学报》 * |
| 王艳萍: "水化水泥颗粒吸附PO43-的影响因素及脱附再生研究", 《中国优秀博硕士学位论文全文数据库（硕士）工程科技I辑》 * |
| 罗绍化等: "《功能材料》", 31 December 2014 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113735327A (en) * | 2021-09-26 | 2021-12-03 | 成都理工大学 | Coagulant for synchronously removing fluorine and phosphorus in phosphorus chemical wastewater and removing method thereof |
| CN117258763A (en) * | 2023-11-16 | 2023-12-22 | 山东吉昌龙环境工程有限公司 | Preparation method of efficient composite deep defluorinating agent |
| CN117258763B (en) * | 2023-11-16 | 2024-02-02 | 山东吉昌龙环境工程有限公司 | Preparation method of efficient composite deep defluorinating agent |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zheng et al. | Fast removal of ammonium ion using a hydrogel optimized with response surface methodology | |
| Su et al. | Polyethyleneimine-functionalized Luffa cylindrica for efficient uranium extraction | |
| CN101298040A (en) | Mercapto-functionalized polyvinyl alcohol-gelatine composite crosslinked microsphere adsorbing agent and preparation thereof | |
| CN111001388B (en) | Preparation method and application of bamboo-based biochar phosphorus removal adsorbent | |
| Wang et al. | Preparation and properties of chitosan/poly (vinyl alcohol) blend foams for copper adsorption | |
| CN110975821A (en) | Silicon dioxide and calcium alginate composite metal ion adsorbent, preparation method and application | |
| CN105107471A (en) | Sulphydryl lignocellulose/montmorillonite composite heavy metal ion adsorbent and preparation and application thereof | |
| CN109111207B (en) | A kind of porous dephosphorization ceramsite and preparation method thereof | |
| CN115041152B (en) | Resin-based neodymium-loaded nanocomposite, preparation method thereof and application thereof in deep removal of phosphate in water | |
| CN104722282A (en) | Synthesizing method of fly ash magnetic bead magnetic adsorbent coated by chitosan | |
| CN110586029A (en) | Salt modified silicate cement phosphorus removal adsorbent, preparation method of adsorbent, regeneration method of adsorbent and application | |
| CN112915973A (en) | Modified fly ash adsorbent and preparation method and application thereof | |
| CN109107524B (en) | A kind of red mud adsorbent and its preparation method and application | |
| CN111298769A (en) | Preparation method and application of lanthanum-modified sycamore biochar | |
| CN106824050A (en) | A kind of preparation method of dephosphorization adsorbent | |
| Chen et al. | Adsorption-desorption of copper (II) by temperature-sensitive nano-biochar@ PNIPAM/alginate double-network composite hydrogel: Enhanced mechanisms and application potentials | |
| CN116196884A (en) | Manganese activated red mud catalytic oxidation adsorption material and preparation method and application thereof | |
| Wang et al. | Synchronously construction of hierarchical porous channels and cationic surface charge on lanthanum-hydrogel for rapid phosphorus removal | |
| CN113289578B (en) | Gasified slag-based composite ammonia nitrogen adsorbent, preparation method and regeneration method thereof, application thereof and method for treating ammonia nitrogen-containing wastewater | |
| Akinpelu et al. | Biosorption of Fe (II) from aqueous solution by brewing waste: equilibrium and kinetic studies | |
| CN114307982B (en) | Preparation method of composite-based modified fly ash particles for static water body restoration | |
| CN112678895B (en) | A kind of water purifying agent and its preparation method and application | |
| Song et al. | Efficient adsorptive separation of Cu (II) from Ph by ZIF-8 constructed with sodium alginate polymer backbone | |
| CN110201638B (en) | Preparation and application of a MOF material | |
| CN103752291B (en) | The method of the acid leaded mining and metallurgy waste water of a kind of polymer based nanocomposites advanced treating |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191220 |